When I drag 'n drop a box to the big header box (JQuery Sortable), it works okay. But when clicking on the dropped box there in the JQuery Sortable box, it does not fire (or works) on the 1st try but it works on the 2nd try.

Can anyone shed some light on why does that happen? I'm thinking the blue bar background color issue is what make the difference in this case, I could be wrong.